A rewrite of the reverse URL parsing: the reverse() call and the "url" template tag.

This is fully backwards compatible, but it fixes a bunch of little bugs. Thanks
to SmileyChris and Ilya Semenov for some early patches in this area that were
incorporated into this change.

Fixed #2977, #4915, #6934, #7206.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@8760 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/urlpatterns_reverse/included_urls.py

@@ -0,0 +1,8 @@
+from django.conf.urls.defaults import *
+from views import empty_view
+
+urlpatterns = patterns('',
+    url(r'^$', empty_view, name="inner-nothing"),
+    url(r'^extra/(?P<extra>\w+)/$', empty_view, name="inner-extra"),
+    url(r'^(?P<one>\d+)|(?P<two>\d+)/$', empty_view, name="inner-disjunction"),
+)